So I'm running low on space on my MBA and I was wondering if there is an efficient way of removing mass amounts of music from iTunes, but not all of the music. Basically there is a ton of songs that I simply don't listen to any more, and most of which I can get on Spotify. At the same time I would like to just store these on an external hard drive. In short I want to separate my iTunes library, keep the files, and not have a bunch of (!) next to the removed songs.